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View Compilation Error

0_0_23195167_14186\Main.java:6: 错误: 程序包Utility不存在
import Utility.TreeNode;  
              ^
0_0_23195167_14186\Main.java:44: 错误: 找不到符号
    public ArrayList<ArrayList<Integer>> zigzagLevelOrder(TreeNode root) {  
                                                          ^
  符号:   类 TreeNode
  位置: 类 Main
0_0_23195167_14186\Main.java:50: 错误: 找不到符号
        Queue<TreeNode> queue = new LinkedList<TreeNode>();  
              ^
  符号:   类 TreeNode
  位置: 类 Main
0_0_23195167_14186\Main.java:50: 错误: 找不到符号
        Queue<TreeNode> queue = new LinkedList<TreeNode>();  
                                               ^
  符号:   类 TreeNode
  位置: 类 Main
0_0_23195167_14186\Main.java:58: 错误: 找不到符号
            TreeNode cur = queue.remove();  
            ^
  符号:   类 TreeNode
  位置: 类 Main
5 个错误


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